The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 2009
Filed:
Nov. 29, 2006
Rei Yamamoto, Tsukuba, JP;
Nobuo Miyadera, Tsukuba, JP;
Rei Yamamoto, Tsukuba, JP;
Nobuo Miyadera, Tsukuba, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Abstract
An optical directional coupler () comprises first and second straight optical waveguides () having respective cores () extending longitudinally close to each other to form an optical coupler portion, and a tapered optical waveguide () having a core () connected to the core () of the first straight waveguide (). The core () of the first straight waveguide () has a centerline (). A width of the core () of the tapered waveguide () becomes narrow toward the first straight waveguide () and a profile of the tapered waveguide () is asymmetric relative to the centerline () of the core () of the first straight waveguides ().